Created
March 15, 2018 23:21
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Generate if-else statements out of a DecisionTree classifier
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from sklearn.tree import _tree | |
def tree_to_code(tree, feature_names): | |
tree_ = tree.tree_ | |
feature_name = [ | |
feature_names[i] if i != _tree.TREE_UNDEFINED else "undefined!" | |
for i in tree_.feature | |
] | |
print ("def tree({}):".format(", ".join(feature_names))) | |
def recurse(node, depth): | |
indent = " " * depth | |
if tree_.feature[node] != _tree.TREE_UNDEFINED: | |
name = feature_name[node] | |
threshold = tree_.threshold[node] | |
print ("{}if {} <= {}:".format(indent, name, threshold)) | |
recurse(tree_.children_left[node], depth + 1) | |
print ("{}else: # if {} > {}".format(indent, name, threshold)) | |
recurse(tree_.children_right[node], depth + 1) | |
else: | |
print ("{}return {}".format(indent, np.argmax(tree_.value[node]))) | |
recurse(0, 1) |
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